Any value lower than 1 would result in this method to return null.
任何低于1的值都将导致此方法返回null。
The only modification required is the quote method: Change the value return null; to return 250.50;.
只需修改quote方法:将值returnnull;更改为return 250.50;。
The only modification required is the quote method: Change the value return null; to return 271.60;.
只需修改quote方法:将值returnnull;
That is, the method is not invoked on a null instance.
也就是说,在空的实例上不调用该方法。
That is, the method is not invoked on a null instance.
也就是说,在空的实例上不调用该方法。
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